I’m stressed and might have to drop out of college?

I’ve been in a vet tech program but it’s distance learning and the instructors said that if I can’t complete the tasks then you have to withdraw otherwise fail but they are things that only doctors do and they don’t really help me at the clinic. The mentorship classes combine with the lectures so they make you withdraw from both if you drop one. I’ve been working so hard getting things done but since there are those couple of tasks the doctors don’t let me do I can’t complete them. It’s kind of messed up. I don’t enjoy this career at all anyway I’m not sure what I would do, I like kids but I don’t know if I would be able to afford something else past an associates degree.